72580421 ÷ 438 
We're looking to find how many times 438 goes into 72580421.

On to step 1:
438 can be fit into 7 0 times, resulting in a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 438

Advancing to step 2:
The number 438 fits into 72 0 times, leaving a remainder of 72.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 72 and we're left with 72.
Take the next digit (5) from the dividend and append it to 72, then repeat: 725 / 438

Moving on to step 3:
If we divide 725 by 438, we get 1 and a remainder of 287.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 438 from 725 and we're left with 287.
Append the next digit (8) from the dividend to 287 and continue with: 2878 / 438

Going ahead to step 4:
The number 438 fits into 2878 6 times, leaving a remainder of 250.
Use 6 as the next digit of our solution. 
Result so far: 16.0
Subtracting 2628 from 2878 leaves us with 250.
Bring next digit (0) of the dividend behind the 250 and repeat the process: 2500 / 438

On to step 5:
When dividing 2500 by 438, we get 5 with a remainder of 310.
The next digit of our result is 5. 
Result so far: 165.0
Subtract 2190 from 2500 to get 310.
Bring next digit (4) of the dividend behind the 310 and repeat the process: 3104 / 438

Let's proceed to step 6:
438 goes into 3104 7 times with a remainder of 38.
Put 7 as the next digit of the answer. 
Result so far: 1657.0
The remainder is 38 after subtracting 3066 from 3104.
Append the next digit (2) from the dividend to 38 and continue with: 382 / 438

Step 7:
The number 438 fits into 382 0 times, leaving a remainder of 382.
Put 0 as the next digit of the answer. 
Result so far: 16570.0
Subtract 0 from 382 to get 382.
Take the next digit (1) from the dividend and append it to 382, then repeat: 3821 / 438

Advancing to step 8:
3821 divided by 438 is 8 with a remainder of 317.
The next digit of our result is 8. 
Result so far: 165708.0
The remainder is 317 after subtracting 3504 from 3821.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3170, and continue the process.

Moving on to step 9:
3170 divided by 438 is 7 with a remainder of 104.
The number 7 becomes the next digit in our result. 
Result so far: 165708.7
Deduct 3066 from 3170 and we're left with 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

Step 10:
438 goes into 1040 2 times with a remainder of 164.
The next digit of our result is 2. 
Result so far: 165708.72
If we take 876 away from 1040, we end up with 164.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1640, and continue the process.

Advancing to step 11:
When dividing 1640 by 438, we get 3 with a remainder of 326.
Write down 3 as next digit of the result. 
Result so far: 165708.723
Deduct 1314 from 1640 and we're left with 326.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3260, and continue the process.

Let's proceed to step 12:
When dividing 3260 by 438, we get 7 with a remainder of 194.
Put 7 as the next digit of the answer. 
Result so far: 165708.7237
The remainder is 194 after subtracting 3066 from 3260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1940, and continue the process.

On to step 13:
If we divide 1940 by 438, we get 4 and a remainder of 188.
Put 4 as the next digit of the answer. 
Result so far: 165708.72374
If we take 1752 away from 1940, we end up with 188.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1880, and continue the process.

Moving on to step 14:
1880 divided by 438 is 4 with a remainder of 128.
Put 4 as the next digit of the answer. 
Result so far: 165708.723744
Subtract 1752 from 1880 to get 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

The final result is 165708.723744 with a remainder of 1.28e-05.